Austin, Texas is the seasonal home to a large population of Mexican free-tailed bats who spend their summers under the Congress Avenue bridge on the edge of downtown. According to Wikipedia it is the largest urban colony in North America, with an estimated 1.5 million bats. The Congress Avenue bat colony is a popular tourist attraction and bat aficionados line the bridge on summer evenings to witness the impressive display as the colony departs into the skies over Austin at… Read more.